this is very weird i find how the shell would make it down the barrel. i could see if it was a 20 gauge shell in a 12 gauge gun, but like he said it was not, my only guess is that part of the brass on the hull broke off when being chambered into the gun, the shell went off and the ejectors had nothing to grab on to , when the next shell was loaded, the hull slid down the barrel a bit, but then the hull hit the forcing cones and didnt go all the way down. that would also explain why the third round didnt go off when it was supposed to. the action could no fully shut. id say it was a mix of crap ammo and gun malfunction. i dont know about you guys but i hate black cloud. they release it and it patterns like garbage so they make special chokes so you can use it. in the end you spend more on ammo and need special chokes so it patterns well, seems like a big waste to me. i have seen to many weird problems with black cloud. i stick to my kent 3'' and remington nitro 3.5'' no problems at all just alot of dead duck and geese.